Football and oracle series (4): from Brazil to Germany, think of the different RAC topology comparison !, Oraclerac

Football and oracle series (4): from Brazil to Germany, think of the different RAC topology comparison !, Oraclerac
Football and oracle series (4): from Brazil to Germany, think of the different RAC topology comparison!

Preliminary review:

I was going to say that tonight, I thought it would be the second semi-finals this morning! Let's take a look at the previous competitions. The first place in the eight group matches has all been promoted to the top eight, showing the technical utility of these eight stages (haha, note: there are no major processes in oracle. It may be a coincidence that a process is important because it is manually specified in some specific scenarios, the process continues to explore the world of oracle football. Let's review:

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Next we will begin to elaborate on this painful. This is a great shame for Brazil, the new history written at the World Cup, and this is happening in the semi-finals. The main role of RAC in oracle's RAC cluster is high availability: Fault Tolerance and load balancing. However, an imperfect architecture will also destroy all of this, just like Brazil, it is unclear what makes your power so fragile. Even with a high-availability environment, it is difficult to ensure real high availability.

RAC in Brazil

Throughout the entire game:

Failure Miscellaneous:

1. Anti-DDoS Pro: optical fiber switch

Performance: Silva was absent, and Brazil's defense team was obviously empty. The Germans once and again even wore the Brazilian defense line from the middle of the cave, which revealed the shortcomings of Brazil's Zhongwei. Brazil's anti-DDoS Pro has been attacked by Germans. This is too exaggerated. It seems that only one fiber-optic switch will never work. Once one fails, all RAC clusters will fail.

2. Front Line: node 1: Front Line

Performance: Neymar's retreat has a huge impact on five-star Brazil. Node 1 fails, and only Node 2 alone bears the business volume. At a moment, node 2 cannot carry the business, the powerlessness of the front line, the collapse of the midfield, everything indicates that rac load balancing at this moment-waste.

3. COACH: RAC heartbeat performance: the Brazilian team suffered a fiasco, And Scolari, as the coach, was cool to blame. Even top-level teams like Brazil collapsed after they were injured in Neymar, which is enough to prove that there is indeed a problem in the selection of people in Scolari. The sanba army, which has lost its two cores, is just a group of scattered sand, why don't I try another striker, just believe in Fred like a chicken. The Brazilian coaching staff with two titles, Scolari and perrera, lost all the world's names in the first world. Let's take a look at the heartbeat mechanism in this cluster. The allocation of IP addresses is completely messy. I don't know where to allocate a single IP address or two IP addresses. What's the heartbeat of RAC? It's like the striker is out of touch with the midfield. If a node crashes, it's time for the coach to respond. There seems to be no response. Vote disks do not know what they are doing. They do not know which line is the top of the line. This is a split-brain problem. It's just a credit of Fred, and the final "amnesia" also appeared, stuck on the past configuration, ah ......

4. goalkeeper: Shared Disk

Performance: despite the hard work, the difficult enemy's fragile anti-DDOS service is so soft and powerless (the optical fiber switch is down, AH), coupled with the German tide-like offensive (this disk read and write efficiency, if there is no anti-DDoS coordination strip, it's really hard to get back to the day ).

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RAC in Germany

Throughout the entire game:

Victory Miscellaneous:

1. goalkeeper: storage display raid10

Performance: the strong goalkeeper and strong support from the backend guard have created this robust German chariot. Storage array: Raid 10 technology.

Raid1 0 is raid0 + raid1, which achieves high-performance striping and high-redundancy images. Noil, the German door god is indeed well known, and the image technology is the guarantee of data. In addition, with the cooperation of anti-DDoS pro, Hu Myles and others are working together to improve the performance of the German backend. This is a team, not a single combat.

2. midfield + defender: fiber switch High Availability

Performance: Two Optical Fiber switches ensure security and high performance. Obviously, the Germans understand this. The anti-DDoS pro is connected with the midfield, and the defender can be defended and attacked. Optical fiber switches provide fault tolerance and high availability.

3. Forward + midfield: multi-node High Availability

Performance: The three nodes are flying together. in the true sense, high availability and high business pressure can also be shared with each other to achieve load balancing.

4. COACH: rac heartbeat

Performance: IP heartbeats respond to each other to ensure synchronization between nodes.

In this lineup, we don't have to worry about "Split-brain" or "amnesia.

Statement:

This is not a technical document. Since I have learned a few tricks about oracle, I cannot afford to sell it to anyone. Just after a meal, I joined several friends in the library. It is just a bit humorous and it can also be used to make fun of others.

At the same time, I have forgotten a lot of oracle knowledge points in recent months. In order to reproduce the knowledge points, I am inspired to publish them in a free form, the examples or stories listed in this article are bound to be far-fetched in terms of technical connection. It's just a note from cainiao. Don't use it as a technical article! I have read and laughed.

Welcome to shoot bricks. This will be the biggest motivation for my growth.